Mortgage interest rates rose last week for the third straight week, hitting the highest level since August. That caused demand from both current homeowners and potential homebuyers to take a big step back. Total mortgage application volume fell 17% last week compared with the previous week, according to the Mortgage Bankers Association’s seasonally adjusted index. The average contract interest rate for 30-year fixed-rate mortgages with conforming loan balances ($766,550 or less) increased to...